From patchwork Mon Feb 6 09:05:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13129498 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F126C05027 for ; Mon, 6 Feb 2023 09:06:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230076AbjBFJGx (ORCPT ); Mon, 6 Feb 2023 04:06:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46498 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229945AbjBFJGt (ORCPT ); Mon, 6 Feb 2023 04:06:49 -0500 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8FF7C1E1CB; Mon, 6 Feb 2023 01:06:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1675674387; x=1707210387; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=SQTxxOlEgl04wx/ixGrmoRoUPwkdiG5NzRRGiGC9ESI=; b=QEC0dcb11E/YFq3r+4bS2q1NdU/Yoc0J7tGIu6VlLIPLLyW1Hwi4rivH 1PcgNRwBtAOLvNK20p14bW9TFO+T1nhkaxKKAmx6XxuSNf9GOamoZBHUG HFHX5paci6jIpra1RwRiY1gocRmzct3f1ZkpL3v91nfo2cqICpSUo+ziU k6/ZkXeZFzVezBypBwYAJzcBMeNMbj2a5kM3SqExp6OqjWGOqsy+/qS3c xOoHnXX920TNWcWnJxoK9FmCSb00qxP3qvvBEkIhwpdhtL/A4/gUZSM2W GuEowm2FjtBX8TL55CKps9G3tuwicBPQPssmxFLt7j5usqGY9iP9ZwjaS g==; X-IronPort-AV: E=McAfee;i="6500,9779,10612"; a="309495873" X-IronPort-AV: E=Sophos;i="5.97,276,1669104000"; d="scan'208";a="309495873" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Feb 2023 01:05:59 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10612"; a="911862834" X-IronPort-AV: E=Sophos;i="5.97,276,1669104000"; d="scan'208";a="911862834" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga006.fm.intel.com with ESMTP; 06 Feb 2023 01:05:57 -0800 From: Yi Liu To: alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com Cc: cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH v2 09/14] vfio-iommufd: Add detach_ioas support for physical VFIO devices Date: Mon, 6 Feb 2023 01:05:27 -0800 Message-Id: <20230206090532.95598-10-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230206090532.95598-1-yi.l.liu@intel.com> References: <20230206090532.95598-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org this prepares for adding DETACH ioctl for physical VFIO devices. Signed-off-by: Yi Liu --- Documentation/driver-api/vfio.rst | 8 +++-- drivers/vfio/fsl-mc/vfio_fsl_mc.c | 1 + drivers/vfio/iommufd.c | 31 ++++++++++++++++--- .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 2 ++ drivers/vfio/pci/mlx5/main.c | 1 + drivers/vfio/pci/vfio_pci.c | 1 + drivers/vfio/platform/vfio_amba.c | 1 + drivers/vfio/platform/vfio_platform.c | 1 + drivers/vfio/vfio_main.c | 3 +- include/linux/vfio.h | 5 +++ 10 files changed, 46 insertions(+), 8 deletions(-) diff --git a/Documentation/driver-api/vfio.rst b/Documentation/driver-api/vfio.rst index 0bfa7261f991..bbc7934fd55d 100644 --- a/Documentation/driver-api/vfio.rst +++ b/Documentation/driver-api/vfio.rst @@ -279,6 +279,7 @@ similar to a file operations structure:: struct iommufd_ctx *ictx, u32 *out_device_id); void (*unbind_iommufd)(struct vfio_device *vdev); int (*attach_ioas)(struct vfio_device *vdev, u32 *pt_id); + void (*detach_ioas)(struct vfio_device *vdev); int (*open_device)(struct vfio_device *vdev); void (*close_device)(struct vfio_device *vdev); ssize_t (*read)(struct vfio_device *vdev, char __user *buf, @@ -314,9 +315,10 @@ container_of(). - The [un]bind_iommufd callbacks are issued when the device is bound to and unbound from iommufd. - - The attach_ioas callback is issued when the device is attached to an - IOAS managed by the bound iommufd. The attached IOAS is automatically - detached when the device is unbound from iommufd. + - The [de]attach_ioas callback is issued when the device is attached to + and detached from an IOAS managed by the bound iommufd. However, the + attached IOAS can also be automatically detached when the device is + unbound from iommufd. - The read/write/mmap callbacks implement the device region access defined by the device's own VFIO_DEVICE_GET_REGION_INFO ioctl. diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c index c89a047a4cd8..d540cf683d93 100644 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c @@ -594,6 +594,7 @@ static const struct vfio_device_ops vfio_fsl_mc_ops = { .bind_iommufd = vfio_iommufd_physical_bind, .unbind_iommufd = vfio_iommufd_physical_unbind, .attach_ioas = vfio_iommufd_physical_attach_ioas, + .detach_ioas = vfio_iommufd_physical_detach_ioas, }; static struct fsl_mc_driver vfio_fsl_mc_driver = { diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c index beef6ca21107..90df1f30b7fd 100644 --- a/drivers/vfio/iommufd.c +++ b/drivers/vfio/iommufd.c @@ -71,14 +71,18 @@ int vfio_iommufd_physical_bind(struct vfio_device *vdev, } EXPORT_SYMBOL_GPL(vfio_iommufd_physical_bind); +static void __vfio_iommufd_detach(struct vfio_device *vdev) +{ + iommufd_device_detach(vdev->iommufd_device); + vdev->iommufd_attached = false; +} + void vfio_iommufd_physical_unbind(struct vfio_device *vdev) { lockdep_assert_held(&vdev->dev_set->lock); - if (vdev->iommufd_attached) { - iommufd_device_detach(vdev->iommufd_device); - vdev->iommufd_attached = false; - } + if (vdev->iommufd_attached) + __vfio_iommufd_detach(vdev); iommufd_device_unbind(vdev->iommufd_device); vdev->iommufd_device = NULL; } @@ -88,6 +92,14 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id) { int rc; + lockdep_assert_held(&vdev->dev_set->lock); + + if (!vdev->iommufd_device) + return -EINVAL; + + if (vdev->iommufd_attached) + return -EBUSY; + rc = iommufd_device_attach(vdev->iommufd_device, pt_id); if (rc) return rc; @@ -96,6 +108,17 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id) } EXPORT_SYMBOL_GPL(vfio_iommufd_physical_attach_ioas); +void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev) +{ + lockdep_assert_held(&vdev->dev_set->lock); + + if (!vdev->iommufd_device || !vdev->iommufd_attached) + return; + + __vfio_iommufd_detach(vdev); +} +EXPORT_SYMBOL_GPL(vfio_iommufd_physical_detach_ioas); + /* * The emulated standard ops mean that vfio_device is going to use the * "mdev path" and will call vfio_pin_pages()/vfio_dma_rw(). Drivers using this diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c index a117eaf21c14..b2f9778c8366 100644 --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c @@ -1373,6 +1373,7 @@ static const struct vfio_device_ops hisi_acc_vfio_pci_migrn_ops = { .bind_iommufd = vfio_iommufd_physical_bind, .unbind_iommufd = vfio_iommufd_physical_unbind, .attach_ioas = vfio_iommufd_physical_attach_ioas, + .detach_ioas = vfio_iommufd_physical_detach_ioas, }; static const struct vfio_device_ops hisi_acc_vfio_pci_ops = { @@ -1391,6 +1392,7 @@ static const struct vfio_device_ops hisi_acc_vfio_pci_ops = { .bind_iommufd = vfio_iommufd_physical_bind, .unbind_iommufd = vfio_iommufd_physical_unbind, .attach_ioas = vfio_iommufd_physical_attach_ioas, + .detach_ioas = vfio_iommufd_physical_detach_ioas, }; static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c index e897537a9e8a..6fc3410989eb 100644 --- a/drivers/vfio/pci/mlx5/main.c +++ b/drivers/vfio/pci/mlx5/main.c @@ -1326,6 +1326,7 @@ static const struct vfio_device_ops mlx5vf_pci_ops = { .bind_iommufd = vfio_iommufd_physical_bind, .unbind_iommufd = vfio_iommufd_physical_unbind, .attach_ioas = vfio_iommufd_physical_attach_ioas, + .detach_ioas = vfio_iommufd_physical_detach_ioas, }; static int mlx5vf_pci_probe(struct pci_dev *pdev, diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 29091ee2e984..cb5b7f865d58 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -141,6 +141,7 @@ static const struct vfio_device_ops vfio_pci_ops = { .bind_iommufd = vfio_iommufd_physical_bind, .unbind_iommufd = vfio_iommufd_physical_unbind, .attach_ioas = vfio_iommufd_physical_attach_ioas, + .detach_ioas = vfio_iommufd_physical_detach_ioas, }; static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c index 83fe54015595..6464b3939ebc 100644 --- a/drivers/vfio/platform/vfio_amba.c +++ b/drivers/vfio/platform/vfio_amba.c @@ -119,6 +119,7 @@ static const struct vfio_device_ops vfio_amba_ops = { .bind_iommufd = vfio_iommufd_physical_bind, .unbind_iommufd = vfio_iommufd_physical_unbind, .attach_ioas = vfio_iommufd_physical_attach_ioas, + .detach_ioas = vfio_iommufd_physical_detach_ioas, }; static const struct amba_id pl330_ids[] = { diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c index 22a1efca32a8..8cf22fa65baa 100644 --- a/drivers/vfio/platform/vfio_platform.c +++ b/drivers/vfio/platform/vfio_platform.c @@ -108,6 +108,7 @@ static const struct vfio_device_ops vfio_platform_ops = { .bind_iommufd = vfio_iommufd_physical_bind, .unbind_iommufd = vfio_iommufd_physical_unbind, .attach_ioas = vfio_iommufd_physical_attach_ioas, + .detach_ioas = vfio_iommufd_physical_detach_ioas, }; static struct platform_driver vfio_platform_driver = { diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index b40c2d95f693..05dd4b89e9d1 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -250,7 +250,8 @@ static int __vfio_register_dev(struct vfio_device *device, if (WARN_ON(device->ops->bind_iommufd && (!device->ops->unbind_iommufd || - !device->ops->attach_ioas))) + !device->ops->attach_ioas || + !device->ops->detach_ioas))) return -EINVAL; /* diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 6a07e1c6c38e..99a6a07e915c 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -74,6 +74,7 @@ struct vfio_device { * @unbind_iommufd: Opposite of bind_iommufd * @attach_ioas: Called when attaching device to an IOAS/HWPT managed by the * bound iommufd. Undo in unbind_iommufd. + * @detach_ioas: Opposite of attach_ioas, this is for runtime undo. * @open_device: Called when the first file descriptor is opened for this device * @close_device: Opposite of open_device * @read: Perform read(2) on device file descriptor @@ -97,6 +98,7 @@ struct vfio_device_ops { struct iommufd_ctx *ictx, u32 *out_device_id); void (*unbind_iommufd)(struct vfio_device *vdev); int (*attach_ioas)(struct vfio_device *vdev, u32 *pt_id); + void (*detach_ioas)(struct vfio_device *vdev); int (*open_device)(struct vfio_device *vdev); void (*close_device)(struct vfio_device *vdev); ssize_t (*read)(struct vfio_device *vdev, char __user *buf, @@ -118,6 +120,7 @@ int vfio_iommufd_physical_bind(struct vfio_device *vdev, struct iommufd_ctx *ictx, u32 *out_device_id); void vfio_iommufd_physical_unbind(struct vfio_device *vdev); int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id); +void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev); int vfio_iommufd_emulated_bind(struct vfio_device *vdev, struct iommufd_ctx *ictx, u32 *out_device_id); void vfio_iommufd_emulated_unbind(struct vfio_device *vdev); @@ -130,6 +133,8 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id); ((void (*)(struct vfio_device *vdev)) NULL) #define vfio_iommufd_physical_attach_ioas \ ((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL) +#define vfio_iommufd_physical_detach_ioas \ + ((void (*)(struct vfio_device *vdev)) NULL) #define vfio_iommufd_emulated_bind \ ((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx, \ u32 *out_device_id)) NULL)